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Author(s):  
Zhou Fang ◽  
Shengyue Wang ◽  
Junxu Liao ◽  
Xinrui Chen ◽  
Yuanyuan Zhu ◽  
...  

Efficient blue thermally activated delayed fluorescence (TADF) emitter is still a challenge in solution-processed organic light-emitting diodes (OLEDs). In this contribution, two asymmetric molecules of TTT-Ac and TTT-2Ac were synthesized...


2022 ◽  
Vol 197 ◽  
pp. 109846
Author(s):  
Chunsheng Cai ◽  
Lei Wang ◽  
Ming Hu ◽  
Li Li ◽  
Jubiao Fu ◽  
...  

Author(s):  
Daniel G Congrave ◽  
Bluebell Drummond ◽  
Qinying Gu ◽  
Stephanie Montanaro ◽  
Haydn Francis ◽  
...  

The unique synergy of properties offered by an efficient and processable near-infrared thermally activated delayed fluorescent (NIR TADF) dye could be transformative across research fields. Here, a solution-processable NIR TADF...


Solar Energy ◽  
2022 ◽  
Vol 231 ◽  
pp. 496-502
Author(s):  
Sheerin Naqvi ◽  
Neeraj Chaudhary ◽  
Rashi Kedia ◽  
Preeti Yadav ◽  
Asit Patra

2021 ◽  
Author(s):  
David Burmeister ◽  
Ha Anh Tran ◽  
Johannes Müller ◽  
Michele Guerrini ◽  
Caterina Cocchi ◽  
...  
Keyword(s):  

Author(s):  
David Burmeister ◽  
Ha Anh Tran ◽  
Johannes Müller ◽  
Michele Guerrini ◽  
Caterina Cocchi ◽  
...  
Keyword(s):  

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 35
Author(s):  
Abhishek Shibu ◽  
Camilla Middleton ◽  
Carly O. Kwiatkowski ◽  
Meesha Kaushal ◽  
Jonathan H. Gillen ◽  
...  

The study of excited-state energy diffusion has had an important impact in the development and optimization of organic electronics. For instance, optimizing excited-state energy migration in the photoactive layer in an organic solar cell device has been shown to yield efficient solar energy conversion. Despite the crucial role that energy migration plays in molecular electronic device physics, there is still a great deal to be explored to establish how molecular orientation impacts energy diffusion mechanisms. In this work, we have synthesized a new library of solution-processable, Zn (alkoxycarbonyl)phenylporphyrins containing butyl (ZnTCB4PP), hexyl (ZnTCH4PP), 2-ethylhexyl (ZnTCEH4PP), and octyl (ZnTCO4PP) alkoxycarbonyl groups. We establish that, by varying the length of the peripheral alkyl chains on the metalloporphyrin macrocycle, preferential orientation and molecular self-assembly is observed in solution-processed thin films. The resultant arrangement of molecules consequently affects the electronic and photophysical characteristics of the metalloporphyrin thin films. The various molecular arrangements in the porphyrin thin films and their resultant impact were determined using UV-Vis absorption spectroscopy, steady-state and time-resolved fluorescence emission lifetimes, and X-ray diffraction in thin films. The films were doped with C60 quencher molecules and the change in fluorescence was measured to derive a relative quenching efficiency. Using emission decay, relative quenching efficiency, and dopant volume fraction as input, insights on exciton diffusion coefficient and exciton diffusion lengths were obtained from a Monte Carlo simulation. The octyl derivative (ZnTCO4PP) showed the strongest relative fluorescence quenching and, therefore, the highest exciton diffusion coefficient (5.29 × 10−3 cm2 s−1) and longest exciton diffusion length (~81 nm). The octyl derivative also showed the strongest out-of-plane stacking among the metalloporphyrins studied. This work demonstrates how molecular self-assembly can be used to modulate and direct exciton diffusion in solution-processable metalloporphyrin thin films engineered for optoelectronic and photonic applications.


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